Hallway, or Tunnel?

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In most places, it may seem off for there to be a tunnel door on the top floor of a building, but Ford was that kind of place. This door from the steam plant led into a skyway and tunnel that connected to the main assembly floor.

The copula where molten metal would pour is on the left. It seems the whole floor was covered in ash in front of it.

To run new gutters through the building, some of the plaster walls of the Chateau had to be smashed through.